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P P e e r r i i o o d d i i c c S S e e r r v v i i c c i i n n g g R R e e q q u u i i r r e e m m e e n n t t s s
M M a a i i n n t t e e n n a a n n c c e e I I n n s s t t r r u u c c t t i i o o n n s s
The following steps should be performed only by a
qualified service technician:
1. Turn OFF gas and electrical power to furnace.
2. Remove door panel.
3. Visually inspect the overall condition of the furnace
components: looking for signs of corrosion,
excessive wear, loose, or frayed wiring, and overall
cleanliness of the furnace.
4. The venting system should be checked for proper
pitch, loose connections, and signs of corrosion.
5. Disconnect the wire to the flame sensor and
remove the ¼" retaining screw. Remove the sensor
and clean if necessary.
N N o o t t e e : : Cleaning the sensor with steel wool is the
approved method. Use of sand paper or
similar materials will eventually result in the
glass deposits of the sandpaper becoming
molten and insulating the small current flow
and loss of operation.
6. Disconnect the wiring to the ignitor. With the ignitor
still in place, measure the resistance of the ignitor.
Resistance should be between 37-70 ohms.
C C l l e e a a n n i i n n g g I I n n s s t t r r u u c c t t i i o o n n s s
The following steps should be performed only by a
qualified service technician:
1. Turn OFF gas and electrical power to furnace.
2. Remove door panel.
3. Disconnect wires to the following components after
identifying and marking the wires. Taking pictures
with a smart phone is also a good aid in when it's
time for re-connection:
a. Burner box limit switch
b. Primary limit switch
c. Gas valve
d. Hot surface igniter
54
e. Flame sensor
f.
Pressure transducer
4. With the use of a back-up wrench on the gas valve,
disconnect the gas supply line from gas valve.
5. Remove screws that attach the burner assembly to
the vestibule panel. The gas valve and J-tube do not
need to be removed from burner box.
N N o o t t e e : : Be careful when removing burner assembly
to avoid breaking igniter.
6. Remove burner box insulation and discard. Re-use
of the burner box insulation is not recommended.
7. Remove insulation sleeves from each tube inlet.
Inspect each sleeve for signs of damage or
overheating. Replace as needed, as a set.
8. Using vacuum cleaner with soft brush attachment,
clean burner assembly. Regulated compressed air
can be used to aid in cleaning.
9. Clean flame sensor with fine steel wool.
10. Inspect ignitor for visible signs of damage or
overheating. Measure resistance of the ignitor with
a VOM. Resistance should be between 37-70 ohms.
Replace if needed.
11. Reinstall the burner box insulation assembly.
12. Reinstall burner assembly.
13. Reconnect wires to the following components:
a. Burner box limit switch
b. Primary limit switch
c. Gas valve
d. Hot surface igniter
e. Flame sensor
f.
Pressure transducer
14. Re-connect gas supply and check for leaks.
15. Set thermostat above room temperature and check
furnace for proper operation.
16. Verify blower airflow and temperature rise is within
the specified range stated on the nameplate.
L8V1-SVX001-1A-EN
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